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Green peach aphid develops resistance to neonicotinoids



May 9, 2017

A joint study between the cesar Australia and the CSIRO has found the first populations of green peach aphid (GPA) in Queensland, South and Western Australia that have begun developing resistance to neonicotinoid pesticides.

Photo © Denis Crawford Graphic Science

Neonicotinoid-based pesticides have been a popular go-to class of chemicals for the control of a range pests on horticultural and agricultural crops, thanks to the resistance developed by many pests to pyrethroids and carbamates.

But for how much longer neonics will remain a useful tool in the growers’ arsenal has been put firmly under a dark cloud, with isolated populations of GPA found developing resistance to neonicotinoid-based insecticides for the first time.

Unlike the genetic mutation that rendered pyrethroids and carbamates completely ineffective, the GPA’s resistance to neonics is metabolic – the aphids are able to detoxify neonics to some extent, resulting in low/moderate resistance.

Does this mean growers needn’t worry about the low levels of resistance and continue with business as usual?  Well, no, say cesar – metabolic resistance is a timely wake up call for growers to carefully manage their practices in the future.

Read more on the cesar website.

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